SmartMovie has its own converter that converts videos to AVI XVID encoded videos that are playable by SmartMovie and no it doesn't support 3GP files.You might try the player from Philips Camcoder.Some(FreshMeat) say that Symbian Helix Player: https://symbian.helixcommunity.org/ can play videos fullscreen.

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I send the 3gp file over bluetooth, the video goes to the Inbox, i open the message and it plays (no fullscreen), i close the player and it asks if i want to save the video i say yes. After this i go to the Gallery and open the video, the video is automaticly rotated 90º and plays in fullscreen (at least on my N80).